You might be giving off a mean girl vibe without even realizing it.

"You could smile once in a while," a TSA airport agent said to me once when I handed him my passport—officially marking the first time I'd been called out for Bitchy Resting Face. (See also: Stewart, Kristen.)

According to plastic surgeon Anthony Youn, M.D., BRF is a legit thing that occurs when you're going about your regs business without realizing you're serving up major Regina George face (or, as Youn politely puts it, looking "thoughtfully sad or angry for no reason.") A slight frown, a dip of the brow—all little things we don't notice that "add together to make us look grumpy, mean, and even, yes, bitchy when we don't mean," Youn said to Today earlier this week.

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The genius term BRF was coined by comedian and journalist Taylor Orci, who told Today that her now-boyfriend avoided her for a year before they started dating because she was always scowling. Ha! "People have been telling me to smile my whole life," Orci says, prompting her to create the fake PSA "Bitchy Resting Face" for YouTube, which quickly racked up over two million hits. Clearly she isn't the only one afflicted with facial features known to freeze out men and frighten toddlers.

Okay, now for the million dollar question: How do you bust out of your BRF rut? "Try to train yourself to smile," says Orci. Sounds easy enough; or just make like K. Stew and make bitch face your thing.